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Stock-Based Compensation and Stock Options - Fair Value of Options Granted (Detail)
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Risk-free interest rate 2.78% 1.88%
Expected volatility 40.00% 41.00%
Expected dividend yield 0.00% 0.00%
Expected weighted average life of option in years 4 years 6 months 4 years 6 months